ltc3406bes5-1.8 Linear Technology Corporation, ltc3406bes5-1.8 Datasheet - Page 5

• Manufacturer Part Number: ltc3406bes5-1.8
• Description: 1.5mhz, 600ma Synchronous Step-down Regulator In Thinsot
• Manufacturer: Linear Technology Corporation

500mA/DIV
(From Figure 1a Except for the Resistive Divider Resistor Values)
PI FU CTIO S
RUN (Pin 1): Run Control Input. Forcing this pin above
1.5V enables the part. Forcing this pin below 0.3V shuts
down the device. In shutdown, all functions are disabled
drawing <1µA supply current. Do not leave RUN floating.
GND (Pin 2): Ground Pin.
SW (Pin 3): Switch Node Connection to Inductor. This pin
connects to the drains of the internal main and synchro-
nous power MOSFET switches.
TYPICAL PERFOR A CE CHARACTERISTICS
5V/DIV
1V/DIV
U
V
RUN
OUT
I
L
Start-Up from Shutdown
V
V
I
LOAD
IN
OUT
= 3.6V
U
= 1.8V
= 600mA (LOAD: 3Ω RESISTOR)
AC COUPLED
100mV/DIV
500mA/DIV
500mA/DIV
I
V
LOAD
OUT
I
40µs/DIV
L
U
V
V
I
Load Step
LOAD
IN
OUT
= 3.6V
= 1.8V
= 100mA TO 600mA
W
20µs/DIV
U
3406B G16
AC COUPLED
100mV/DIV
500mA/DIV
500mA/DIV
I
V
LOAD
OUT
I
L
3406B G19
Load Step
V
V
I
LOAD
IN
OUT
= 3.6V
= 1.8V
= 0mA TO 600mA
20µs/DIV
V
to GND, Pin 2, with a 2.2µF or greater ceramic capacitor.
V
feedback voltage from an external resistive divider across
the output.
V
age Feedback Pin. An internal resistive divider divides the
output voltage down for comparison to the internal refer-
ence voltage.
IN
FB
OUT
(Pin 4): Main Supply Pin. Must be closely decoupled
AC COUPLED
(Pin 5) (LTC3406B): Feedback Pin. Receives the
(Pin 5) (LTC3406B-1.5/LTC3406B-1.8): Output Volt-
100mV/DIV
500mA/DIV
500mA/DIV
I
V
LOAD
OUT
I
L
3406B G17
Load Step
V
V
I
LOAD
IN
OUT
= 3.6V
= 1.8V
= 200mA TO 600mA
AC COUPLED
100mV/DIV
500mA/DIV
500mA/DIV
I
V
LOAD
OUT
I
20µs/DIV
L
V
V
I
Load Step
LOAD
IN
OUT
= 3.6V
= 1.8V
= 50mA TO 600mA
20µs/DIV
3406B G20
LTC3406B
3406bfa
3406B G18
5